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The MB_PRO connector is used to connect a Sound Blaster card to a Modem Blaster card. The signals can also be re-purposed for other uses.

The pin arrangement is as follows:

9 7 5 3 1
10 8 6 4 N/C

The purpose of the pins, from the point of view of the sound card, are:[1]

Pin Purpose
1 Audio GND
2 Key, no pin
3 Line-in
4 Audio GND
5 Line left TODO: Is this line out?
6 Audio GND
7 Line right (out?)
8 Modem speaker input. On a sound card, this input receives a line-level audio signal from the modem.
9 Audio GND
10 Microphone in Isn't this mic out for the modem?

TAD conversion

Some sound cards have an MB_PRO connector but no TAD connector. A cable can be made to allow internal modems with a TAD socket to be hooked up to the MB_PRO connector:

TAD pin
Sound card
MB_PRO pin
1 8 Phone line audio, from modem to sound card.
2 6 GND
3 9 GND
4 10 Microphone audio, from sound card to modem.

TAD pins 2 and 3 can also be patched to any of the other GND signals on the MB_PRO connector if that is more convenient. The two in the above table are just one possibility.


  1. Creative Labs - Pin Assignment of I/O Jacks and Connectors on Sound Blaster Devices